400552021000989 has 144 divisors (see below), whose sum is σ = 701875573701120. Its totient is φ = 218074222080000.

The previous prime is 400552021000973. The next prime is 400552021001029. The reversal of 400552021000989 is 989000120255004.

It is a happy number.

400552021000989 is a `hidden beast` number, since 4 + 0 + 0 + 552 + 0 + 2 + 1 + 0 + 0 + 0 + 98 + 9 = 666.

It is not a de Polignac number, because 400552021000989 - 2⁴ = 400552021000973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400552021000949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 274346292 + ... + 275802450.

It is an arithmetic number, because the mean of its divisors is an integer number (4874135928480).

Almost surely, 2^{400552021000989} is an apocalyptic number.

It is an amenable number.

400552021000989 is a deficient number, since it is larger than the sum of its proper divisors (301323552700131).

400552021000989 is a wasteful number, since it uses less digits than its factorization.

400552021000989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456644 (or 1456628 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The spelling of 400552021000989 in words is "four hundred trillion, five hundred fifty-two billion, twenty-one million, nine hundred eighty-nine", and thus it is an aban number.